Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 48, Problem 4SQ
To determine
Mention the preferred method of the plugging switch connection to the motor or the driven machine.
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The figure below shows a 50Hz balanced star-star three-phase circuit with line loss. The load impedance Z = 40 + j15.08 Ω.(a)Calculate the line load impedance ZL.(b)Determine the average power:(i)Delivered by the three-phase source.(ii)Delivered to the three-phase load.(iii)Absorbed by the three-phase line.(c)Calculate the power efficiency of the system.
Three concentric spherical shells 7=1, 7=2, 7=3 m, respectively, have
charge distriutions 2, 4 and 5 μC/m².
(a) Calculate the flux through 7=1.5 m² and r = 2.5m.
(b) Find D at 7=0.5m, r=2.5m, and r=3.5m .
Verify the divergence theorem for the function A = r²a, + r sin 0 cos > a, over the
surface of a quarter of a hemisphere defined by 0 < r < 3, 0 < & < π/2, 0 < 0 < π/2.
Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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- A charge distribution of the following form is set up in air: p₁ =10% e C/m³, where 7 is the radial distance of he spherical coordinates. Find the electric field intensity Ę everywhere.arrow_forwardQ1. a) b) A 200V DC series motor has armature resistance of 0.1 Q and field resistance of 0.15 Q. The motor runs at a speed of 600 rev/min when the shaft torque is 28 Nm. Friction and windage losses at this speed are 251.3 W. Calculate armature current, copper loss and efficiency. A DC shunt motor has an armature resistance of 0.22, a field resistance of 200 and is connected to a 200 V supply. i) Draw the equivalent electrical circuit of the motor ii) If the motor runs at 1500 rpm and takes a current of 11 A from the supply, calculate the output torque of the motor iii) If the supply voltage is kept constant but the load torque is changed so that the supply current decreased to 6 A, determine the motor speed and the output torque.arrow_forwardThree concentric spherical shells 7=1, 7=2, 7=3 m, respectively, have charge distriutions 2, 4 and 5 µC/m². (a) Calculate the flux through 7=1.5m and r = 2.5 m. (b) Find D at 7=0.5m, r=2.5m, and 7= 3.5m.arrow_forward
- im not sure this answer makes sense to me. The question is "Between which terminal block and screw numbers is relay coil CR-7 located?" The answer points towards lines in a seperate text? My answer was "TB-5B between screw numbers 2 & 10" could someone please review this and let me know if I am correct? (This is not for a graded assignment, It is not worth any marks and my professor has not released any answer keys)arrow_forwardNeed Handwritten solution do not use chatgpt or AIarrow_forwardThe figure below shows a 60-Hz balanced star-star three-phase circuit.(a) For the equivalent circuits of the load impedance Z shown in (ii), calculate the load impedance Z, the line current IA, the power factor, and the total average power delivered to the three-phase load.(b) The power factor is corrected to 1.00 by inserting a capacitance in parallel to the resistive and inductive load as shown in (iii). Determine the capacitance value C.arrow_forward
- For a series resonant circuit with the following specifications:1. A resonant frequency fn = 4.5kHz.2. A bandwidth BW = 150Hz3. A peak current Imax = 100mA at resonance.(a) Find the values of the quality factor, the resistance, the inductance, and the capacitance.(b) Calculate the power consumed and energy stored at the resonance.(c) Determine the inductance and capacitance required to reduce the bandwidth of the resonant circuit to 70 Hz without changing the resonant frequency or peak current.arrow_forwardFor a series resonant circuit with the following specifications:1. A resonant frequency fn = 4.5kHz.2. A bandwidth BW = 150Hz3. A peak current Imax = 100mA at resonance.(a) Find the values of the quality factor, the resistance, the inductance, and the capacitance Assiming V=5<0o.(b) Calculate the power consumed and energy stored at the resonance.(c) Determine the inductance and capacitance required to reduce the bandwidth of the resonant circuit to 70 Hz without changing the resonant frequency or peak current.arrow_forward. Apply the divergence theorem to evaluate A ds, where A = x²a¸ + y²a, + z²a, and S is the surface of the solid bounded by the cylinder p = 1 and planes z = 2 and z = 4. Sarrow_forward
- Don't use ai to answer I will report you answerarrow_forwardThe figure below shows a 60-Hz balanced star-star three-phase circuit.(a) For the equivalent circuits of the load impedance Z shown in (ii), calculate the load impedance Z, the line current IA, the power factor, and the total average power delivered to the three-phase load.(b) The power factor is corrected to 1.00 by inserting a capacitance in parallel to the resistive and inductive load as shown in (iii). Determine the capacitance value C.arrow_forwardGiven the volume charge distribution in cylindrical coordinates as 12p nC/m³, P₁₁ = 10. 1arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
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